fixed deprecation warning from pandas #3310

Job	Run time
codecheck / codecheck	45m 46s
linux / linux (-doc-mpi-)	43m 30s
linux / linux (-mpi-)	52m 59s
mac / macports (macos-13)	17m 16s
linux / linux (-coverage-mpi-)	1h 4m 10s
mac / macports (+allmodules, macos-13)	28m 46s
mac / macsimple (macos-13)	11m 13s
mac / macsimple (macos-14)	6m 29s
linux / linux (-debug-)	30m 17s
linux / linux (-debug-mpi-)	41m 57s
linux / linux (-intel-)	47m 18s
conda / conda (ubuntu-20.04)	9m 31s
linux / linux (-pycv-mpi-)	18m 52s
docker / docker (fedora39)	19m 55s
conda / conda (macos-13)	20m 21s
linux / linux (-nvhpc-mpi-)	57m 35s
docker / docker (rocky8)	22m 41s
conda / conda (macos-14)	7m 15s
	9h 5m 51s

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